Question

question :---

When an arsenic atom is introduced in place of silicon in a crystal lattice, the conductivity............
(a) increases
(b) decreases
(c) remains the same
(d) sometimes increases and sometimes decreases

answer with reason .. please​

Answer 1

Explanation:

decrease

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When a silicon crystal is doped with a group 15 elements such as P,As,Sb or Bi the structure of the crystal lattice is left unchanged but an occasional atom with five valence electrons occupies a site that would normally be occupied by a silicon atom. 

The foreign atom uses four of its electrons in covalent bonding but the remaining fifth electron becomes delocalized and is thus free to contribute to electrical conduction. 

Thus, both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

Option B is the answer.